Google Earth Engine - Calculates the effective width of rivers using publicly available river data

The code for this tutorial uses two publicly available datasets (GSW and HydroLakes_polygons) and an updated river network (Updated_river_network) uploaded as a shareable asset.The objective is to use the GSW dataset to estimate the effective river width for different water volumes (i.e. 1, 10, 20, 30, 40, 50%) along the model river network.

The code does this by creating a buffer around the line segment on the river network, estimating the area of ​​the water pixel, and then dividing the water area by the line segment length to calculate the "effective width".

Currently, this code can only be applied to a single segment (defined by the unique segment ID at L95) at any time.The code runs successfully and the effective width of each water occurrence is written to the .csv file.

Code:

// GEE code to estimate effective river widths from Global Surface Water (GSW) occurrences.// v1.1 - July 2022//[email protected]// Uses code from Gennadii Donchyts - https://code.earthengine.google.com/2dbde97cb9d7326af7779f5cc4b91b93// Uses code from RivWidthCloud (Yang et al., 2019) - https://doi.org/10.1109/LGRS.2019.2920225// Builds on code from RODEO (Riggs et al., 2022) - https://doi.org/10.1016/j.envsoft.2021.105254///// Datasets//var GSW = ee.Image('JRC/GSW1_3/GlobalSurfaceWater');var GSW_o